Seems like life is a palindrome
Cry when you die, cry when you're born
In between it's all about the ups and downs
Add them all together, they'll cancel each other out
— Glen Phillips, from "Duck and Cover"

Cut the eggplant, bell pepper, and onion into 1-inch cubes. Toss them in a large bowl with the garlic, olive oil, salt, and pepper. Scrape the mixture out and spread onto a baking sheet. Roast for 40 minutes, until the vegetables are lightly browned and soft, tossing once during cooking. Cool slightly.

Place the vegetables in a food processor fitted with a steel blade, add the tomato paste, and pulse 3 or 4 times to blend. Taste for salt and pepper.